| 摘要 |
The invention relates to bronchodilator compounds of formula I (I) wherein R2 is hydrogen, lower alkyl, or phenyl; R5 is lower alkyl; and R7 is methoxy, methylthio or wherein X is independently oxygen, sulfur, methylene alkyl (-CH2-), imido (-NH-) or N-lower alkylimido (-N-); and pharmaceutically acceptable acid-addition salts are disclosed. Pharmaceutical formulations comprising such compounds and pharmacological methods of using such compounds are also disclosed. |
